If 24-hour excess rainfall to be impounded in 1m width of land between two consecutive contour bunds with a vertical interval of 2 m is 1 cm, then what will be the depth of impounding near bund?
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Notice that the ______land slope ($S$) cancels out______ during the derivation!
This means the maximum depth of water behind the bund ($d$) depends only on the vertical interval ($VI$) and the excess rainfall depth ($ER$), simplifying calculations.